Postcard



FIG. 1 is a front view of a postcard, embodying my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof, the bottom view being a mirror image thereof; and,

FIG. 4 is a right side view thereof, the left side view being a mirror image thereof.

The postcard is flat. The broken lines are included for showing features that form no part of the claim. 

CLAIM The ornamental design for a postcard, as shown and described. 